Tonneau cover rail



FIG. 1 is a perspective view of the Tonneau cover rail;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a right side elevational view thereof.

The ornamental design for a Tonneau cover rail, as shown and described.